15 photos of the butter cow, Star Trek exhibit at the Iowa State Fair

Sarah Pratt puts some final touches on the butter cow in the John Deere Agriculture Building on the fairgrounds.

Sarah Pratt puts some final touches on the butter cow in the John Deere Agriculture Building on the fairgrounds.

Sarah Pratt puts some final touches on the butter cow in the John Deere Agriculture Building on the fairgrounds.

Sarah Pratt works on the butter cow in the John Deere Agriculture Building on the fairgrounds.

Sarah Pratt puts some final touches on the butter cow in the John Deere Agriculture Building on the fairgrounds.

Nyota Uhura and Spock are ready for fairgoers in the John Deere Agriculture Building on the fairgrounds. The Iowa State Fair celebrates 50 years of "Star Trek" this year with a companion piece to the butter cow.

The butter cow takes a look at Nyota Uhura and Spock in the John Deere Agriculture Building on the fairgrounds. The Iowa State Fair celebrates 50 years of "Star Trek" this year with a companion piece to the butter cow.

On the right, the butter cow is just about ready for the crowds at the Iowa State Fair. To the left, a replica of the Starship Enterprise floats in the John Deere Agriculture Building on the fairgrounds. The Iowa State Fair celebrates 50 years of "Star Trek" this year with a companion piece to the butter cow.

The butter cow looks at the skeleton of Capt. James T Kirk, the commander of the Starship Enterprise. The Iowa State Fair celebrates the 50th anniversary of "Star Trek" with a butter cow companion piece in the John Deere Agriculture Building.

On the right, the butter cow is just about ready for the crowds at the Iowa State Fair. To the left, a replica of the Starship Enterprise floats in the John Deere Agriculture Building on the fairgrounds. The Iowa State Fair celebrates 50 years of "Star Trek" this year with a companion piece to the butter cow.

Nyota Uhura and Spock are ready for fairgoers in the John Deere Agriculture Building on the fairgrounds.

A replica of the Starship Enterprise floats in the John Deere Agriculture Building on the fairgrounds. The Iowa State Fair celebrates 50 years of "Star Trek" this year with a companion piece to the butter cow.

A replica of the Starship Enterprise floats in the John Deere Agriculture Building on the fairgrounds. The Iowa State Fair celebrates 50 years of "Star Trek" this year with a companion piece to the butter cow.